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发表于 2008-8-8 14:56:54
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An Electrostatic discharge (ESD) has been experienced by everyone by feeling a little shock when touching a metal doorknob after walking across a carpeted room or sliding across a car seat. It has always been a very important cause of problem in the industry: for instance, as early as the 1400's, European and Caribbean forts were using static control procedures and devices to prevent electrostatic discharge ignition of black powder stores. The age of electronics brought with it new problems associated with static electricity and electrostatic discharge. And, as electronic devices became faster and smaller, their sensitivity to ESD increased. Today, ESD impacts productivity and product reliability in virtually every aspect of today's electronics environment.
During an electrostatic discharge, a high peak current flows within one nanosecond, and high electric and magnetic fields are generated as a secondary effect. The electrostatic discharge can destroy circuits, so protective mechanisms and a good board layout are needed to suppress these transients in electronic equipment. |
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发表于 2008-8-11 13:05:55
